build: support publish latest image

.github/workflows/docker-build-push.yml → .github/workflows/publish-latest.yml

@@ -1,26 +1,23 @@
-name: Build and Push Docker Image
+name: Publish Latest Image
 
 on:
   push:
     branches:
       - master
+    paths-ignore:
+      - 'docs/**'
+      - 'README.md'
+      - '.gitignore'
   workflow_dispatch:
 
 jobs:
-  build-and-push:
+  publish-latest-image:
     runs-on: ubuntu-latest
 
     steps:
       - name: Checkout
         uses: actions/checkout@v4
 
-      - name: Extract Syncplay version from Dockerfile
-        id: get-version
-        run: |
-          syncplay_version=$(grep -oP '(?<=ENV SYNCPLAY=")[^"]+' Dockerfile)
-          echo "syncplay_version=${syncplay_version}"
-          echo "syncplay_version=${syncplay_version}" >> $GITHUB_OUTPUT
-
       - name: Set up QEMU
         uses: docker/setup-qemu-action@v3
 
@@ -30,17 +27,24 @@ jobs:
       - name: Login to Docker Hub
         uses: docker/login-action@v3
         with:
-          username: ${{ secrets.DOCKERHUB_USERNAME }}
+          username: ${{ vars.DOCKERHUB_USER }}
           password: ${{ secrets.DOCKERHUB_TOKEN }}
 
-      - name: Build and push
-        uses: docker/build-push-action@v5
+      - name: Login to GitHub Package Registry
+        uses: docker/login-action@v3
+        with:
+          registry: ghcr.io
+          username: ${{ github.repository_owner }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Build and Push
+        uses: docker/build-push-action@v6
         with:
           context: .
           platforms: linux/amd64,linux/arm64,linux/386,linux/arm/v7
-          push: true
           tags: |
-            ${{ secrets.DOCKER_IMAGE }}:v${{ steps.get-version.outputs.syncplay_version }}
-            ${{ secrets.DOCKER_IMAGE }}:latest
+            ${{ vars.DOCKER_IMAGE }}:latest
+            ghcr.io/${{ vars.DOCKER_IMAGE }}:latest
+          push: true
           cache-from: type=gha
           cache-to: type=gha,mode=max